|
Author
|
Topic: calculating Hc
|
David
|
posted May 16, 2017 01:32 PM
When calculating Hc using data from the Nautical Almanac and Sight Reduction Tables I am further from the Ho than if I input the raw data into “USNO celestial Navigation Data for Assumed Position and Time.” If I use an assumed longitude closest to my DR longitude the result is not as good as if I use an assumed longitude rounded to the next highest degree of longitude.
For example, using the following data:
Date: May 14 , 2017
UT= 22 08 49
DR Lat=44 0.7
Lon= 92 31.3
AP Lat= 44
Long= 92 7.1
Using Nautical Almanac and Sight Reduction Tables, I obtain an HC of 33 09
But,
Using “USNO celestial Navigation Data for Assumed Position and Time.”, I obtain an HC of 33 57.1
My Ho=34 13.6
Can you figure out why this is so? I believe I am using the correct assumed longitude. I did note that if I use an assumed longitude of 93 7.1 I get an Hc much closer to my Ho using the Nautical Almanac and Sight Reduction Tables
I appreciate your help. Your book is great. I bought an additional copy for a friend of mine.
David Driscoll
From: Minnesota
|
|
David
|
posted May 17, 2017 06:16 AM
Belay my question dated 5/16/2017.....I found the error I was making
David
From: Minnesota
|
|
|
